After certain TG, the DW-linear speed (rotational speed) decreases (increases), which indicates the Walker breakdown phenomena. With the further increment of TG, both DW-linear and rotational speeds show increasing trends. After the Walker breakdown limit, the biaxial nanowire behaves like a uniaxial nanowire and the DW linear and rotational speeds increase similarly to the uniaxial nanowire. These DW dynamics can be explained by microscopic theory as stating that more magnons are populated in the hotter region and travel from the hotter to the colder region. During crossing the DW, the magnon exerts a magnonic torque on the DW by transferring spin angular momentum to the DW. In this way, magnons drive the DW toward the hotter region of the nanowire, opposite to the direction of the magnonic current [1]}, [2]}, [3]}, [4]}. These findings are also consistent with the macroscopic theory [5]}, [6]}.
<FIGURE>